Blank for forming a lid of a container



FIG. 1 is a top plan view incorporating the new design (the bottom view is a mirror image of the top view);

FIG. 2 is a front view thereof (the back view is a mirror image of the front view);

FIG. 3 is a right side view thereof (the left side view is a mirror image of the right side view); and,

FIG. 4 is a top perspective view thereof.

The broken lines in the figures are illustrative of features that form no part of the claimed design. 

CLAIM The ornamental design for a blank for forming a lid of a container, as shown and described. 